EP2236781B1 - Pressure control valve - Google Patents

Pressure control valve Download PDF

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Publication number
EP2236781B1
EP2236781B1 EP10155334.5A EP10155334A EP2236781B1 EP 2236781 B1 EP2236781 B1 EP 2236781B1 EP 10155334 A EP10155334 A EP 10155334A EP 2236781 B1 EP2236781 B1 EP 2236781B1
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EP
European Patent Office
Prior art keywords
valve
hollow cylinder
opening
pressure control
housing
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Application number
EP10155334.5A
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German (de)
French (fr)
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EP2236781A1 (en
Inventor
Jorge Soares
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Polytec Plastics Germany GmbH and Co KG
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Polytec Plastics Germany GmbH and Co KG
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Publication of EP2236781A1 publication Critical patent/EP2236781A1/en
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/04—Control of fluid pressure without auxiliary power
    • G05D16/06—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule
    • G05D16/063—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane
    • G05D16/0644—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator
    • G05D16/0655—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator using one spring-loaded membrane
    • G05D16/0658—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator using one spring-loaded membrane characterised by the form of the obturator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/0011—Breather valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/0011—Breather valves
    • F01M2013/0016—Breather valves with a membrane

Definitions

  • the invention relates to a pressure control valve, in particular a pressure control valve, which can be used for venting of crankshaft housings in motor vehicles.
  • a suitable pressure control valve is off DE 20 2004 003 860 known.
  • This pressure regulating valve has a housing with an inlet and an outlet.
  • the inlet is connectable to the interior of the crankshaft housing and the outlet to the intake tract of the internal combustion engine.
  • a valve opening is provided, which can be closed by a control membrane.
  • the control diaphragm spans the valve opening and is held by a housing cover.
  • the housing cover has an opening, so that on the side facing away from the valve opening side of the control diaphragm Ambient pressure prevails. Due to the connection of the outlet of the valve with the intake manifold of the engine, the gas is exhausted from the crankcase. As a result, a slight negative pressure in the crankcase is generated.
  • the control diaphragm is pushed away from the valve opening by a coil spring.
  • a closing of the valve opening by the control membrane takes place at a corresponding pressure difference between the environment, ie the outer membrane side and the pressure prevailing inside the housing negative pressure.
  • the pressure difference must be so large that the force applied by the spring is overcome.
  • the negative pressure fluctuates in the intake tract.
  • the amount of gas extracted from the crankcase also fluctuates greatly.
  • a force generated in the direction of the valve opening due to the pressure difference between the two membrane sides acts on the control diaphragm. Counteracting this force is the spring force of the spiral spring.
  • a further force acts on the diaphragm due to the negative pressure in the valve outlet or the negative pressure of the engine connected to the valve outlet.
  • the force generated due to the negative pressure in the intake tract varies depending on the operating condition of the engine.
  • the valve opens or closes at different pressures in the crankshaft housing depending on the operating state of the engine. It is thus not possible with such a pressure control valve to dissipate a substantially constant amount of gas from the crankcase.
  • Out DE 200 16 214 a pressure regulating valve is known.
  • a slide is provided, which is flowed through transversely to the direction of displacement.
  • Out GB 648302 is a pressure control valve with axially flow valve known.
  • the object of the invention is to provide a pressure control valve, in which, despite fluctuating pressure conditions at the outlet as uniform as possible volume flow can be realized.
  • the pressure control valve according to the invention which can preferably be used for discharging gas from crankcase housings in motor vehicle engines, has a housing with an inlet and an outlet.
  • the inlet When used in conjunction with a crankshaft housing, the inlet is connected to the interior of the crankshaft housing and the outlet to the intake manifold of the engine.
  • a valve opening is provided within the housing.
  • the valve opening can be opened and closed by a control element. In the open state, the gas to be discharged, for example, from the crankshaft housing thus flows through the inlet into the housing and then flows through the valve opening to the outlet of the pressure regulating valve.
  • a hollow cylinder is arranged in the valve opening.
  • the preferably round hollow cylinder is flowed through with the valve open by the gas in the direction of the outlet of the housing.
  • the hollow cylinder is thus tubular and has an inlet opening and an outlet opening.
  • the pressure regulating valve preferably has a closing element which is in particular rigidly connected to the housing and by which the hollow cylinder, in particular the outlet opening of the hollow cylinder, can be closed.
  • the closing element thus has, in a preferred embodiment, a cross section corresponding essentially to the cross section of the hollow cylinder. In a round hollow cylinder, the closing element is thus formed substantially disc-shaped.
  • the hollow cylinder is displaced according to the invention for opening and closing the valve.
  • a displacement of the hollow cylinder takes place in the longitudinal direction thereof.
  • a displaceably arranged hollow cylinder has the advantage that the closing element can be rigidly connected to the housing.
  • the hollow cylinder is connected to the control element in particular rigid or fixed. It is particularly preferred in this case that the hollow cylinder is flowed through with its valve open in its longitudinal direction. According to the invention, therefore, an inlet opening of the hollow cylinder of an outlet opening of the Hollow cylinder arranged opposite. This can be a further homogenization of the flow be achieved.
  • the inlet opening and the outlet opening of the hollow cylinder are not only arranged opposite each other, but additionally arranged coaxially with the valve opening. As a result, tilting or tilting of the hollow cylinder is avoided in particular with fluctuating flows.
  • the inventive provision of a hollow cylinder in the valve opening has the further advantage that low flow resistance can continue to be realized and the space requirement of the pressure control valve according to the invention over that of conventional, known from the prior art pressure control valves must be increased.
  • the hollow cylinder which is preferably rigidly connected to the control element, preferably further comprises a sealing element.
  • the sealing element in particular designed as a sealing ring and integral with the hollow cylinder is preferably arranged in the region of the inlet opening of the hollow cylinder.
  • control element has a control membrane.
  • actuation i. Moving the Hohzylinders due to the pressure difference prevailing between the two membrane sides.
  • the membrane preferably spans a housing opening closed by a housing cover.
  • On the housing cover facing side of the membrane is preferably ambient pressure.
  • the housing cover has an opening connected to the environment.
  • the elasticity of the membrane itself can in this case be designed such that it generates a force pointing away from the valve opening, which must be overcome to close the valve.
  • the control element has a spring element for this purpose.
  • the spring element can be an element made of an elastomeric plastic or else a spring, such as a spiral spring.
  • the spring element may for example be designed as a tension spring and arranged between the control diaphragm and the housing cover.
  • the arrangement of the spring element is preferably on the same side of the membrane as the hollow cylinder.
  • the spring element, which is designed in particular as a spiral spring is thus a compression spring, which is compressed to close the valve opening, ie when moving the hollow cylinder.
  • the switching point of the pressure control valve ie the required pressure difference to close the valve, can be defined in a simple manner.
  • the pressure valve according to the invention preferably has a closing element, in particular rigidly connected to the housing, for closing the hollow cylinder.
  • the closing element in particular closes the outlet opening of the hollow cylinder.
  • the closing element is disc-shaped, wherein preferably an upper side of the closing element is aligned substantially perpendicular to the longitudinal direction of the hollow cylinder or to the flow direction in the hollow cylinder. In this way, a uniform, reliable closing of the hollow cylinder can be realized by means of the closing element.
  • the pressure control valve according to the invention is preferably used for the venting of a crankshaft housing in motor vehicles.
  • the pressure regulating valve can also be used in other gas flows. A preferred use is in this case, if prevail in the outlet of the pressure control valve fluctuating pressure conditions.
  • the pressure control valve according to the invention has a housing 10.
  • the housing 10 has an inlet 12, for example, with a Interior of a crankcase of a motor vehicle engine is connected. Furthermore, the housing 10 has an outlet 14, which is connected, for example, to an intake tract of an automobile engine. Furthermore, the housing 10 has a housing cover 16, which closes a housing opening 18. The housing opening 18 is closed by a control element 20.
  • the control element 20 has in the illustrated embodiment, a control diaphragm 22 which spans the entire housing opening 18.
  • the control membrane 22 has a thickening 24 in the edge region. By means of the annular thickening 24, the control diaphragm 22 is fixed between the housing cover 16 and the housing 10.
  • the housing cover 16 has an opening 26 which is connected to the environment. In a region 28, which is bounded by the control element 20 and the housing cover 16, there is thus ambient pressure.
  • a valve opening 30 is provided.
  • a hollow cylinder 32 is arranged.
  • the hollow cylinder 32 is in the valve opening 30 in the longitudinal direction, ie for closing in the direction of an arrow 34 (FIG. Fig. 1 ) and to open in the direction of an arrow 36 (FIG. Fig. 2 ) displaceable.
  • the hollow cylinder 30 is connected via an intermediate element 38 with the control element 20.
  • the control element 20 for this purpose has a plate-shaped holding member 40. This particular plate-shaped holding member 40 is partially surrounded by the rule membrane 22 for connecting the two parts at the edge.
  • the intermediate element 38 preferably has a plurality of webs, so that the smallest possible flow resistance occurs in the region of an inlet opening 42 of the hollow cylinder 32.
  • the hollow cylinder 32 in the longitudinal direction partially surrounding spring element 44 is provided between the control diaphragm 22 and the hollow cylinder 32.
  • the spring element 44 is formed as a helical spring.
  • the spring element 44 rests on the one hand on the inside of the retaining element 40 of the control element 20 and on the other side on a support surface 46 of the housing.
  • a particularly plate-shaped closing element 48 is rigidly connected to the housing 10.
  • the closing element 48 closes in the closed state of the valve ( Fig. 2 ) an outlet opening 50 of the hollow cylinder.
  • the hollow cylinder 32 has on the direction of the control membrane 22 side facing a radially outwardly facing, annular projection 52.
  • the projection 52 carries a likewise annular design sealing element 54, which in the closed state of the valve ( Fig. 2 ) rests against a sealing surface 56 of the housing 10.
  • the gas flows from the crankcase through the inlet 12 into the valve housing 10.
  • the gas flows in through the inlet opening 46 of the hollow cylinder 32 in Fig. 1 down and exits at the outlet opening 50 of the hollow cylinder 32.
  • the gas then flows laterally past the closure member 48 toward the outlet 14 connected to the intake manifold of the engine.
  • the pressure prevailing in the intake tract of the engine and therefore also in the region of the outlet 14 has only a very small influence on the basic mode of operation of the pressure regulating valve described above.
  • the pressure prevailing in the outlet region 14 acts essentially only on the annular surface 58. Since the surface 58, compared to the total cross section of the hollow cylinder 32, is very small, the influence of the In the outlet region 14 prevailing pressure caused force very low. Therefore, pressure fluctuations in this area have only a small influence.

Description

Die Erfindung betrifft ein Druckregelventil, insbesondere ein Druckregelventil, das zur Entlüftung von Kurbelwellengehäusen bei Kraftfahrzeugen einsetzbar ist.The invention relates to a pressure control valve, in particular a pressure control valve, which can be used for venting of crankshaft housings in motor vehicles.

Bei Verbrennungsmotoren gelangt ein Teil des Verbrennungsgases über die Kolbenringe in das Kurbelgehäuse. Um einen Überdruck im Kurbelgehäuse zu verhindern ist eine Entlüftung erforderlich. Über ein entsprechendes Druckregelventil, das im Kurbelwellengehäuse angeordnet ist, erfolgt ein Entlüften des Kurbelgehäuses, wobei der Auslass des Ventils üblicherweise mit dem Ansaugtrakt des Motors verbunden ist. Zusätzlich ist dem Druckregelventil eine Abscheideeinheit vorgeschaltet, um das Ansaugen von Feinöltröpfchen aus dem Kurbelwellengehäuse zu verhindern.In internal combustion engines, a portion of the combustion gas passes through the piston rings in the crankcase. To prevent overpressure in the crankcase venting is required. Via a corresponding pressure control valve, which is arranged in the crankshaft housing, there is a venting of the crankcase, wherein the outlet of the valve is usually connected to the intake tract of the engine. In addition, a separation unit is connected upstream of the pressure control valve in order to prevent the suction of fine oil droplets from the crankcase.

Ein geeignetes Druckregelventil ist aus DE 20 2004 003 860 bekannt. Dieses Druckregelventil weist ein Gehäuse mit einem Einlass und einem Auslass auf. Der Einlass ist mit dem Inneren des Kurbelwellengehäuses und der Auslass mit dem Ansaugtrakt des Verbrennungsmotors verbindbar. Innerhalb des Gehäuses ist eine Ventilöffnung vorgesehen, die durch eine Regelmembran verschließbar ist. Die Regelmembran überspannt die Ventilöffnung und ist von einem Gehäusedeckel gehalten. Der Gehäusedeckel weist eine Öffnung auf, so dass auf der von der Ventilöffnung abgewandten Seite der Regelmembran Umgebungsdruck herrscht. Aufgrund der Verbindung des Auslasses des Ventils mit dem Ansaugtrakt des Motors erfolgt ein Absaugen des Gases aus dem Kurbelwellengehäuse. Hierdurch wird ein geringer Unterdruck im Kurbelwellengehäuse erzeugt. Die Regelmembran wird durch eine Spiralfeder von der Ventilöffnung weg gedrückt. Ein Verschließen der Ventilöffnung durch die Regelmembran erfolgt bei einer entsprechenden Druckdifferenz zwischen der Umgebung, d.h. der äußeren Membranseite und dem innerhalb des Gehäuses herrschenden Unterdrucks. Hierbei muss die Druckdifferenz so groß sein, dass die durch die Feder aufgebrachte Kraft überwunden wird.A suitable pressure control valve is off DE 20 2004 003 860 known. This pressure regulating valve has a housing with an inlet and an outlet. The inlet is connectable to the interior of the crankshaft housing and the outlet to the intake tract of the internal combustion engine. Within the housing, a valve opening is provided, which can be closed by a control membrane. The control diaphragm spans the valve opening and is held by a housing cover. The housing cover has an opening, so that on the side facing away from the valve opening side of the control diaphragm Ambient pressure prevails. Due to the connection of the outlet of the valve with the intake manifold of the engine, the gas is exhausted from the crankcase. As a result, a slight negative pressure in the crankcase is generated. The control diaphragm is pushed away from the valve opening by a coil spring. A closing of the valve opening by the control membrane takes place at a corresponding pressure difference between the environment, ie the outer membrane side and the pressure prevailing inside the housing negative pressure. Here, the pressure difference must be so large that the force applied by the spring is overcome.

In Abhängigkeit des Betriebszustandes des Motors schwankt der Unterdruck im Ansaugtrakt. Dies führt dazu, dass die Menge des aus dem Kurbelgehäuse abgesaugten Gases ebenfalls stark schwankt. Im Betrieb wirkt auf die Regelmembran einerseits eine aufgrund des Druckunterschiedes zwischen den beiden Membranseiten erzeugte Kraft in Richtung der Ventilöffnung. Dieser Kraft entgegengerichtet ist die Federkraft der Spiralfeder. Ferner wirkt auf die Membran aufgrund des Unterdrucks in den Ventilauslass bzw. dem mit dem Ventilauslass verbundenen Ansaugtrakt des Motors herrschenden Unterdruck eine weitere Kraft. Die aufgrund des Unterdrucks in dem Ansaugtrakt erzeugte Kraft schwankt in Abhängigkeit des Betriebszustandes des Motors. Dies führt dazu, dass das Ventil in Abhängigkeit des Betriebszustandes des Motors bei unterschiedlichen Drücken im Kurbelwellengehäuse öffnet bzw. schließt. Es ist mit einem derartigen Druckregelventil somit nicht möglich, eine im Wesentlichen konstante Gasmenge aus dem Kurbelgehäuse abzuführen.Depending on the operating condition of the engine, the negative pressure fluctuates in the intake tract. As a result, the amount of gas extracted from the crankcase also fluctuates greatly. In operation, on the one hand, a force generated in the direction of the valve opening due to the pressure difference between the two membrane sides acts on the control diaphragm. Counteracting this force is the spring force of the spiral spring. Furthermore, a further force acts on the diaphragm due to the negative pressure in the valve outlet or the negative pressure of the engine connected to the valve outlet. The force generated due to the negative pressure in the intake tract varies depending on the operating condition of the engine. As a result, the valve opens or closes at different pressures in the crankshaft housing depending on the operating state of the engine. It is thus not possible with such a pressure control valve to dissipate a substantially constant amount of gas from the crankcase.

Aus DE 200 16 214 ist ein Druckregelventil bekannt. Zur Drosselung des Strömungsquerschnitts ist ein Schieber vorgesehen, der quer zur Verschieberichtung durchströmt wird. Aus GB 648302 ist ein Druckregelventil mit axial durchströmbarem Ventil bekannt. Aufgabe der Erfindung ist es, ein Druckregelventil zu schaffen, bei dem trotz schwankender Druckverhältnisse am Auslass ein möglichst gleichmäßiger Volumenstrom realisierbar ist.Out DE 200 16 214 a pressure regulating valve is known. For throttling the flow cross section, a slide is provided, which is flowed through transversely to the direction of displacement. Out GB 648302 is a pressure control valve with axially flow valve known. The object of the invention is to provide a pressure control valve, in which, despite fluctuating pressure conditions at the outlet as uniform as possible volume flow can be realized.

Die Lösung der Aufgabe erfolgt erfindungsgemäß durch die Merkmale des Anspruchs 1.The object is achieved according to the invention by the features of claim 1.

Das erfindungsgemäße Druckregelventil, das vorzugsweise zum Abführen von Gas aus Kurbelwellengehäusen bei Kraftfahrzeugmotoren verwendet werden kann, weist ein Gehäuse mit einem Einlass und einem Auslass auf. Bei Verwendung in Verbindung mit einem Kurbelwellengehäuse ist der Einlass mit dem inneren des Kurbelwellengehäuses und der Auslass mit dem Ansaugtrakt des Motors verbunden. Innerhalb des Gehäuses ist eine Ventilöffnung vorgesehen. Die Ventilöffnung ist durch ein Regelelement öffenbar und schließbar. In geöffnetem Zustand strömt das beispielsweise aus dem Kurbelwellengehäuse abzuführende Gas somit durch den Einlass in das Gehäuse ein und strömt sodann durch die Ventilöffnung hindurch zum Auslass des Druckregelventils. Erfindungsgemäß ist in der Ventilöffnung ein Hohlzylinder angeordnet. Der vorzugsweise rund ausgebildete Hohlzylinder wird bei geöffnetem Ventil von dem Gas in Richtung des Auslasses des Gehäuses durchströmt. Der Hohlzylinder ist somit rohrförmig ausgebildet und weist eine Einlassöffnung sowie eine Auslassöffnung auf. Vorzugsweise weist das Druckregelventil ein insbesondere starr mit dem Gehäuse verbundenes Schließelement auf, durch das der Hohlzylinder, insbesondere die Auslassöffnung des Hohlzylinders, verschließbar ist. Das Schließelement weist somit in bevorzugter Ausführungsform einen im Wesentlichen dem Querschnitt des Hohlzylinders entsprechenden Querschnitt auf. Bei einem runden Hohlzylinder ist das Schließelement somit im Wesentlichen scheibenförmig ausgebildet.The pressure control valve according to the invention, which can preferably be used for discharging gas from crankcase housings in motor vehicle engines, has a housing with an inlet and an outlet. When used in conjunction with a crankshaft housing, the inlet is connected to the interior of the crankshaft housing and the outlet to the intake manifold of the engine. Within the housing, a valve opening is provided. The valve opening can be opened and closed by a control element. In the open state, the gas to be discharged, for example, from the crankshaft housing thus flows through the inlet into the housing and then flows through the valve opening to the outlet of the pressure regulating valve. According to the invention, a hollow cylinder is arranged in the valve opening. The preferably round hollow cylinder is flowed through with the valve open by the gas in the direction of the outlet of the housing. The hollow cylinder is thus tubular and has an inlet opening and an outlet opening. The pressure regulating valve preferably has a closing element which is in particular rigidly connected to the housing and by which the hollow cylinder, in particular the outlet opening of the hollow cylinder, can be closed. The closing element thus has, in a preferred embodiment, a cross section corresponding essentially to the cross section of the hollow cylinder. In a round hollow cylinder, the closing element is thus formed substantially disc-shaped.

Der Hohlzylinder ist erfindungsgemäß zum Öffnen und Schließen des Ventils verschiebbar. Vorzugsweise erfolgt ein Verschieben des Hohlzylinders in dessen Längsrichtung. Ein verschiebbar angeordneter Hohlzylinder hat den Vorteil, dass das Schließelement starr mit dem Gehäuse verbunden sein kann. Vorzugsweise ist der Hohlzylinder mit dem Regelelement insbesondere starr bzw. fest verbunden. Besonders bevorzugt ist es hierbei, dass der Hohlzylinder bei geöffnetem Ventil in seiner Längsrichtung durchströmt wird. Erfindungsgemäß ist somit eine Einlassöffnung des Hohlzylinders einer Auslassöffnung des Hohlzylinders gegenüberliegend angeordnet. Hierdurch kann eine weitere Vergleichmäßigung der Strömung
erzielt werden. Erfindungsgemäß sind die Einlassöffnung und die Auslassöffnung des Hohlzylinders nicht nur einander gegenüberliegend angeordnet, sondern zusätzlich koaxial zu der Ventilöffnung angeordnet. Hierdurch ist insbesondere bei schwankenden Strömungen ein Verkanten bzw. Verkippen des Hohlzylinders vermieden.The hollow cylinder is displaced according to the invention for opening and closing the valve. Preferably, a displacement of the hollow cylinder takes place in the longitudinal direction thereof. A displaceably arranged hollow cylinder has the advantage that the closing element can be rigidly connected to the housing. Preferably, the hollow cylinder is connected to the control element in particular rigid or fixed. It is particularly preferred in this case that the hollow cylinder is flowed through with its valve open in its longitudinal direction. According to the invention, therefore, an inlet opening of the hollow cylinder of an outlet opening of the Hollow cylinder arranged opposite. This can be a further homogenization of the flow
be achieved. According to the invention, the inlet opening and the outlet opening of the hollow cylinder are not only arranged opposite each other, but additionally arranged coaxially with the valve opening. As a result, tilting or tilting of the hollow cylinder is avoided in particular with fluctuating flows.

Aufgrund des erfindungsgemäßen Vorsehens eines insbesondere in Längsrichtung verschiebbaren Hohlzylinders kann auch bei schwankenden Druckverhältnissen am Auslass des Druckregelventils eine Vergleichmäßigung des durch die Ventilöffnung strömenden Gasvolumens erzielt werden. Dies liegt insbesondere darin begründet, dass die Angriffsfläche der durch den im Auslass des Ventils schwankenden Druck erzeugten Kraft aufgrund des Vorsehens eines Hohlzylinders realisiert ist. Hierbei ist zu berücksichtigen, dass, in vereinfachter Betrachtung, im Wesentlichen nur die in Längsrichtung bzw. in axiale Richtung wirkenden Kräfte relevant sind. Da die durch den Druck erzeugte Kraft von der Fläche abhängig ist, auf die dieser wirkt, und die hinsichtlich der in Längsrichtung wirkenden Kraft relevante Fläche aufgrund des Hohlzylinders gegenüber dem Stand der Technik erheblich reduziert wurde, konnte die durch den im Auslass herrschenden Druck hervorgerufene Kraft erheblich reduziert werden. Dies hat zur Folge, dass Druckschwankungen im Auslass einen deutlich geringeren Einfluss auf den durch die Ventilöffnung strömenden Volumenstrom haben.Due to the provision according to the invention of a hollow cylinder which can be displaced, in particular in the longitudinal direction, a homogenization of the gas volume flowing through the valve opening can be achieved even under fluctuating pressure conditions at the outlet of the pressure regulating valve. This is due in particular to the fact that the engagement surface of the force generated by the pressure fluctuating in the outlet of the valve is realized due to the provision of a hollow cylinder. It should be noted that, in a simplified view, essentially only the forces acting in the longitudinal direction or in the axial direction are relevant. Since the force generated by the pressure is dependent on the surface on which it acts and the area relevant to the force acting in the longitudinal direction due to the hollow cylinder has been considerably reduced compared to the prior art, the force caused by the pressure prevailing in the outlet could be significantly reduced. As a result, pressure fluctuations in the outlet have a significantly smaller influence on the volume flow flowing through the valve opening.

Das erfindungsgemäße Vorsehen eines Hohlzylinders in der Ventilöffnung hat ferner den Vorteil, dass weiterhin geringe Strömungswiderstände realisiert werden können und auch der Bauraumbedarf des erfindungsgemäßen Druckregelventils gegenüber demjenigen herkömmlicher, aus dem Stand der Technik bekannter Druckregelventile erhöht werden muss.The inventive provision of a hollow cylinder in the valve opening has the further advantage that low flow resistance can continue to be realized and the space requirement of the pressure control valve according to the invention over that of conventional, known from the prior art pressure control valves must be increased.

Der Hohlzylinder, der vorzugsweise starr mit dem Regelelement verbunden ist, weist vorzugsweise ferner ein Dichtelement auf. Das Dichtelement, das insbesondere als Dichtring ausgebildet und einstückig mit dem Hohlzylinder hergestellt ist, ist vorzugsweise im Bereich der Einlassöffnung des Hohlzylinders angeordnet. Bei geschlossenem Ventil liegt der Dichtring an dem Gehäuse des Ventils, insbesondere einem Gehäuseansatz an. Um das Ventil vollständig zu schließen liegt der Hohlzylinder, insbesondere die Auslassöffnung des Hohlzylinders, an dem Schließelement an.The hollow cylinder, which is preferably rigidly connected to the control element, preferably further comprises a sealing element. The sealing element, in particular designed as a sealing ring and integral with the hollow cylinder is preferably arranged in the region of the inlet opening of the hollow cylinder. When the valve is closed, the sealing ring on the housing of the valve, in particular a housing approach. In order to close the valve completely, the hollow cylinder, in particular the outlet opening of the hollow cylinder, bears against the closing element.

In bevorzugter Ausführungsform weist das Regelelement eine Regelmembran auf. Erfindungsgemäß erfolgt ein Betätigen, d.h. Verschieben des Hohzylinders aufgrund der zwischen den beiden Membranseiten herrschenden Druckdifferenz. Vorzugsweise überspannt die Membran eine mit einem Gehäusedeckel verschlossene Gehäuseöffnung. Auf der dem Gehäusedeckel zugewandten Seite der Membran herrscht vorzugsweise Umgebungsdruck. Hierzu weist der Gehäusedeckel eine mit der Umgebung verbundene Öffnung auf.In a preferred embodiment, the control element has a control membrane. According to the invention, actuation, i. Moving the Hohzylinders due to the pressure difference prevailing between the two membrane sides. The membrane preferably spans a housing opening closed by a housing cover. On the housing cover facing side of the membrane is preferably ambient pressure. For this purpose, the housing cover has an opening connected to the environment.

Die Elastizität der Membran selbst kann hierbei derart ausgebildet sein, dass sie eine von der Ventilöffnung weg weisende Kraft erzeugt, die zum Schließen des Ventils überwunden werden muss. Vorzugsweise weist hierzu das Regelelement jedoch ein Federelement auf. Bei dem Federelement kann es sich um ein aus einem elastomeren Kunststoff hergestelltes Element oder auch um eine Feder, wie eine Spiralfeder, handeln. Das Federelement kann beispielsweise als Zugfeder ausgebildet und zwischen der Regelmembran und dem Gehäusedeckel angeordnet sein. Bevorzugt ist die Anordnung des Federelements jedoch auf derselben Membranseite wie der Hohlzylinder. Das Federelement, das insbesondere als Spiralfeder ausgebildet ist, ist somit eine Druckfeder, die zum Verschließen der Ventilöffnung, d.h. beim Verschieben des Hohlzylinders zusammengedrückt wird. Insbesondere durch die Wahl der durch das Federelement erzeugten Gegenkraft kann der Schaltpunkt des Druckregelventils, d.h. die erforderliche Druckdifferenz zum Schließen des Ventils, auf einfache Weise definiert werden.The elasticity of the membrane itself can in this case be designed such that it generates a force pointing away from the valve opening, which must be overcome to close the valve. Preferably, however, the control element has a spring element for this purpose. The spring element can be an element made of an elastomeric plastic or else a spring, such as a spiral spring. The spring element may for example be designed as a tension spring and arranged between the control diaphragm and the housing cover. However, the arrangement of the spring element is preferably on the same side of the membrane as the hollow cylinder. The spring element, which is designed in particular as a spiral spring, is thus a compression spring, which is compressed to close the valve opening, ie when moving the hollow cylinder. In particular, by the choice of the counterforce generated by the spring element, the switching point of the pressure control valve, ie the required pressure difference to close the valve, can be defined in a simple manner.

Ferner weist das erfindungsgemäße Druckventil vorzugsweise ein insbesondere starr mit dem Gehäuse verbundenes Schließelement zum Verschließen des Hohlzylinders auf. Durch das Schließelement erfolgt insbesondere ein Verschließen der Auslassöffnung des Hohlzylinders. In besonders bevorzugter Ausführungsform ist das Schließelement scheibenförmig ausgebildet, wobei vorzugsweise eine Oberseite des Schließelements im Wesentlichen senkrecht zur Längsrichtung des Hohlzylinders bzw. zur Strömungsrichtung in dem Hohlzylinder ausgerichtet ist. Hierdurch kann ein gleichmäßiges, zuverlässiges Verschließen des Hohlzylinders mit Hilfe des Schließelements realisiert werden.Furthermore, the pressure valve according to the invention preferably has a closing element, in particular rigidly connected to the housing, for closing the hollow cylinder. The closing element in particular closes the outlet opening of the hollow cylinder. In a particularly preferred embodiment, the closing element is disc-shaped, wherein preferably an upper side of the closing element is aligned substantially perpendicular to the longitudinal direction of the hollow cylinder or to the flow direction in the hollow cylinder. In this way, a uniform, reliable closing of the hollow cylinder can be realized by means of the closing element.

Das erfindungsgemäße Druckregelventil ist vorzugsweise für die Entlüftung eines Kurbelwellengehäuses bei Kraftfahrzeugen verwendbar. Das Druckregelventil ist jedoch auch in anderen Gasströmungen einsetzbar. Ein bevorzugter Einsatz erfolgt hierbei, wenn im Auslassbereich des Druckregelventils schwankende Druckverhältnisse herrschen.The pressure control valve according to the invention is preferably used for the venting of a crankshaft housing in motor vehicles. However, the pressure regulating valve can also be used in other gas flows. A preferred use is in this case, if prevail in the outlet of the pressure control valve fluctuating pressure conditions.

Nachfolgend wird die Erfindung anhand einer bevorzugten Ausführungsform unter Bezugnahme auf die anliegenden Zeichnungen näher erläutert.The invention will be explained in more detail with reference to a preferred embodiment with reference to the accompanying drawings.

Es zeigen:

Fig. 1
eine schematische Schnittansicht einer bevorzugten Ausführungsform des erfindungsgemäßen Druckregelventils in geöffnetem Zustand, und
Fig. 2
eine schematische Schnittansicht einer bevorzugten Ausführungsform des erfindungsgemäßen Druckregelventils in geschlossenem Zustand.
Show it:
Fig. 1
a schematic sectional view of a preferred embodiment of the pressure control valve according to the invention in the open state, and
Fig. 2
a schematic sectional view of a preferred embodiment of the pressure control valve according to the invention in the closed state.

Das erfindungsgemäße Druckregelventil weist ein Gehäuse 10 auf. Das Gehäuse 10 weist einen Einlass 12 auf, der beispielsweise mit einem Innenraum eines Kurbelwellengehäuses eines Kraftfahrzeugmotors verbunden ist. Ferner weist das Gehäuse 10 einen Auslass 14 auf, der beispielsweise mit einem Ansaugtrakt eines Kraftfahrzeugmotors verbunden ist. Ferner weist das Gehäuse 10 einen Gehäusedeckel 16 auf, der eine Gehäuseöffnung 18 verschließt. Die Gehäuseöffnung 18 ist durch ein Regelelement 20 verschlossen. Das Regelelement 20 weist im dargestellten Ausführungsbeispiel eine Regelmembran 22 auf, die die gesamte Gehäuseöffnung 18 überspannt. Die Regelmembran 22 weist im Randbereich eine Verdickung 24 auf. Mittels der ringförmig ausgebildeten Verdickung 24 ist die Regelmembran 22 zwischen dem Gehäusedeckel 16 und dem Gehäuse 10 fixiert.The pressure control valve according to the invention has a housing 10. The housing 10 has an inlet 12, for example, with a Interior of a crankcase of a motor vehicle engine is connected. Furthermore, the housing 10 has an outlet 14, which is connected, for example, to an intake tract of an automobile engine. Furthermore, the housing 10 has a housing cover 16, which closes a housing opening 18. The housing opening 18 is closed by a control element 20. The control element 20 has in the illustrated embodiment, a control diaphragm 22 which spans the entire housing opening 18. The control membrane 22 has a thickening 24 in the edge region. By means of the annular thickening 24, the control diaphragm 22 is fixed between the housing cover 16 and the housing 10.

Der Gehäusedeckel 16 weist eine Öffnung 26 auf, die mit der Umgebung verbunden ist. In einem Bereich 28, der durch das Regelelement 20 und den Gehäusedeckel 16 begrenzt ist, herrscht somit Umgebungsdruck.The housing cover 16 has an opening 26 which is connected to the environment. In a region 28, which is bounded by the control element 20 and the housing cover 16, there is thus ambient pressure.

Innerhalb des Ventilgehäuses 10 ist eine Ventilöffnung 30 vorgesehen. In der Ventilöffnung 30 ist ein Hohlzylinder 32 angeordnet. Der Hohlzylinder 32 ist in der Ventilöffnung 30 in Längsrichtung, d.h. zum Verschließen in Richtung eines Pfeils 34 (Fig. 1) und zum Öffnen in Richtung eines Pfeils 36 (Fig. 2) verschiebbar. Der Hohlzylinder 30 ist über ein Zwischenelement 38 mit dem Regelelement 20 verbunden. Im dargestellten Ausführungsbeispiel weist das Regelelement 20 hierzu ein plattenförmig ausgebildetes Halteelement 40 auf. Dieses insbesondere tellerförmig ausgebildete Halteelement 40 ist am Rand teilweise von der Regelmembran 22 zur Verbindung der beiden Teile umgeben. Das Zwischenelement 38 weist vorzugsweise mehrere Stege auf, so dass im Bereich einer Eintrittsöffnung 42 des Hohlzylinders 32 möglichst geringe Strömungswiderstände auftreten.Within the valve housing 10, a valve opening 30 is provided. In the valve opening 30, a hollow cylinder 32 is arranged. The hollow cylinder 32 is in the valve opening 30 in the longitudinal direction, ie for closing in the direction of an arrow 34 (FIG. Fig. 1 ) and to open in the direction of an arrow 36 (FIG. Fig. 2 ) displaceable. The hollow cylinder 30 is connected via an intermediate element 38 with the control element 20. In the illustrated embodiment, the control element 20 for this purpose has a plate-shaped holding member 40. This particular plate-shaped holding member 40 is partially surrounded by the rule membrane 22 for connecting the two parts at the edge. The intermediate element 38 preferably has a plurality of webs, so that the smallest possible flow resistance occurs in the region of an inlet opening 42 of the hollow cylinder 32.

Ferner ist zwischen der Regelmembran 22 und dem Hohlzylinder 32 ein im dargestellten Ausführungsbeispiel den Hohlzylinder 32 in Längsrichtung teilweise umgebendes Federelement 44 vorgesehen. Im dargestellten Ausführungsbeispiel ist das Federelement 44 als Schraubenfeder ausgebildet.Further, in the illustrated embodiment, the hollow cylinder 32 in the longitudinal direction partially surrounding spring element 44 is provided between the control diaphragm 22 and the hollow cylinder 32. In the illustrated embodiment, the spring element 44 is formed as a helical spring.

Das Federelement 44 liegt einerseits an der Innenseite des Halteelements 40 des Regelelements 20 und auf der anderen Seite auf einer Auflagefläche 46 des Gehäuses an.The spring element 44 rests on the one hand on the inside of the retaining element 40 of the control element 20 and on the other side on a support surface 46 of the housing.

Ferner ist mit dem Gehäuse 10 starr ein insbesondere tellerförmig ausgebildetes Schließelement 48 verbunden. Das Schließelement 48 verschließt in geschlossenem Zustand des Ventils (Fig. 2) eine Auslassöffnung 50 des Hohlzylinders.Further, a particularly plate-shaped closing element 48 is rigidly connected to the housing 10. The closing element 48 closes in the closed state of the valve ( Fig. 2 ) an outlet opening 50 of the hollow cylinder.

Der Hohlzylinder 32 weist auf der in Richtung der Regelmembran 22 weisenden Seite einen radial nach außen weisenden, ringförmigen Ansatz 52 auf. Der Ansatz 52 trägt ein ebenfalls ringförmig ausgebildetes Dichtelement 54, das in geschlossenem Zustand des Ventils (Fig. 2) an einer Dichtfläche 56 des Gehäuses 10 anliegt.The hollow cylinder 32 has on the direction of the control membrane 22 side facing a radially outwardly facing, annular projection 52. The projection 52 carries a likewise annular design sealing element 54, which in the closed state of the valve ( Fig. 2 ) rests against a sealing surface 56 of the housing 10.

Mittels eines weiteren, im Bereich der Auslassöffnung 50 des Hohlzylinders angeordneten Dichtelements 58 erfolgt ein dichtes Verschließen der Auslassöffnung 50 durch Anlage an dem Schließelement 48 (Fig. 2).By means of a further, arranged in the region of the outlet opening 50 of the hollow cylinder sealing member 58, a tight closure of the outlet opening 50 by abutment against the closing element 48 (FIG. Fig. 2 ).

In dem geöffneten Zustand des Ventils (Fig. 1) strömt das Gas bei Verwendung des Druckregelventils in Verbindung mit einem Kurbelwellengehäuse aus dem Kurbelwellengehäuse durch den Einlass 12 in das Ventilgehäuse 10 ein. In dem Ventilgehäuse 10 strömt das Gas durch die Einlassöffnung 46 des Hohlzylinders 32 in Fig. 1 nach unten und tritt an der Auslassöffnung 50 des Hohlzylinders 32 aus. Das Gas strömt sodann seitlich an dem Schließelement 48 vorbei in Richtung des mit dem Ansaugtrakt des Motors verbundenen Auslasses 14.In the opened state of the valve ( Fig. 1 When the pressure control valve is used in conjunction with a crankcase, the gas flows from the crankcase through the inlet 12 into the valve housing 10. In the valve housing 10, the gas flows in through the inlet opening 46 of the hollow cylinder 32 in Fig. 1 down and exits at the outlet opening 50 of the hollow cylinder 32. The gas then flows laterally past the closure member 48 toward the outlet 14 connected to the intake manifold of the engine.

Sobald der Druck innerhalb des Gehäuses 10 und in dem Bereich zwischen der Regelmembran 22 und dem Hohlzylinder 32 und somit auch im Kurbelwellengehäuse sinkt, nimmt die Druckdifferenz zwischen den beiden Membranseiten der Regelmembran 22 zu. Aufgrund der Zunahme der Druckdifferenz wirkt auf die Regelmembran eine in Fig. 1 nach unten in Richtung eines Pfeils 60 wirkende Kraft. Der Kraft 60 wirkt die beim Zusammendrücken der Spiralfeder 44 erzeugte Kraft entgegen. Sobald die Kraft 60 bei steigender Druckdifferenz größer ist als die durch die Feder ausgeübte Kraft, bewegt sich die Regelmembran 22 in die Geschlossenstellung (Fig. 2). Da mit der Regelmembran 22 über das Halteelement 40 und das Zwischenelement 38 auch der Hohlzylinder 32 verbunden ist, wird der Hohlzylinder 32 in Fig. 1 nach unten in die in Fig. 2 dargestellte Geschlossenstellung verschoben.As soon as the pressure within the housing 10 and in the region between the control diaphragm 22 and the hollow cylinder 32 and thus also in the crankshaft housing decreases, the pressure difference between the two membrane sides of the control diaphragm 22 increases. Due to the increase in Pressure difference acts on the control diaphragm one in Fig. 1 down in the direction of an arrow 60 force. The force 60 counteracts the force generated during compression of the coil spring 44. As soon as the force 60 with increasing pressure difference is greater than the force exerted by the spring, the control diaphragm 22 moves into the closed position (FIG. Fig. 2 ). Since with the control diaphragm 22 via the holding member 40 and the intermediate member 38 and the hollow cylinder 32 is connected to the hollow cylinder 32 in Fig. 1 down to the in Fig. 2 shifted closed position shifted.

Auf die vorstehend beschriebene, prinzipielle Funktionsweise des Druckregelventils hat der im Ansaugtrakt des Motors und somit auch im Bereich des Auslasses 14 herrschende Druck nur einen sehr geringen Einfluss. Hinsichtlich einer durch diesen Druck erzeugten, in Fig. 1 nach unten, d.h. in Richtung des Pfeils 60 wirkenden Kraft wirkt der im Auslassbereich 14 herrschende Druck im Wesentlichen nur auf die ringförmige Fläche 58. Da die Fläche 58, verglichen mit dem Gesamtquerschnitt des Hohlzylinders 32, sehr gering ist, ist der Einfluss der durch den in dem Auslassbereich 14 herrschenden Druck hervorgerufene Kraft sehr gering. Daher haben auch Druckschwankungen in diesem Bereich nur einen geringen Einfluss.The pressure prevailing in the intake tract of the engine and therefore also in the region of the outlet 14 has only a very small influence on the basic mode of operation of the pressure regulating valve described above. Regarding one produced by this pressure, in Fig. 1 downward, ie acting in the direction of the arrow 60, the pressure prevailing in the outlet region 14 acts essentially only on the annular surface 58. Since the surface 58, compared to the total cross section of the hollow cylinder 32, is very small, the influence of the In the outlet region 14 prevailing pressure caused force very low. Therefore, pressure fluctuations in this area have only a small influence.

Claims (12)

  1. Pressure control valve, in particular for crank case ventilation in motor vehicle engines, comprising
    a housing (10) having an inlet (12) and an outlet (14),
    a valve opening (30) arranged inside the housing (10),
    a control element (20) opening and closing the valve opening (30) depending on a pressure difference, and
    a hollow cylinder (32) arranged in the valve opening (30), the cylinder being displaceable in the longitudinal direction (34, 36) to open and/or close the valve,
    characterized in that
    an inlet opening (42) of the hollow cylinder (32) is situated opposite an outlet opening (50) of the hollow cylinder (32), wherein the inlet opening (42), the outlet opening (50) and the valve opening (30) are coaxial with respect to each other, so that in the open state of the valve, the hollow cylinder (32) can be flowed through in its longitudinal direction (34) towards the outlet (14).
  2. Pressure control valve of claim 1, characterized by a sealing element (54) surrounding the inlet opening (42) of the hollow cylinder (32), the element abutting against the housing (10) when the valve is in the closed state.
  3. Pressure control valve of claim 1 or 2, characterized in that a closing element (48) rigidly connected to the housing (10) is provided for closing the outlet opening (15) of the hollow cylinder (32).
  4. Pressure control valve of one of claims 1 to 3, characterized in that the hollow cylinder (32) is connected, in particular rigidly connected to the control element (20).
  5. Pressure control valve of one of claims 1 to 4, characterized in that the closing element (48) is disc-shaped and a top surface of the closing element (48) is preferably oriented substantially vertically to the longitudinal direction (34) of the hollow cylinder (32).
  6. Pressure control valve of one of claims 1 to 5, characterized in that the sealing element (54) surrounds the inlet opening (42).
  7. Pressure control valve of one of claims 1 to 6, characterized in that the sealing element (54) is designed as a sealing ring and, in the closed state of the valve, abuts against a housing protrusion of the housing (10).
  8. Pressure control valve of one of claims 1 to 7, characterized in that the control element (20) has a control diaphragm (22), wherein an actuation, in particular a displacement of the hollow cylinder (32) occurs as a result of the pressure difference prevailing between the two sides of the diaphragm.
  9. Pressure control valve of claim 8, characterized in that ambient pressure prevails on the diaphragm side averted from the hollow cylinder (32).
  10. Pressure control valve of claim 8 or 9, characterized in that the control diaphragm (22) is supported by a housing cover (16) having an opening (26) connected to the environment.
  11. Pressure control valve of one of claims 1 to 10, characterized in that the control element (20) has a spring element (44), wherein the valve is closed against the spring force.
  12. Pressure control valve of claim 11, characterized in that the spring element (44) is arranged on the same side of the membrane as the hollow cylinder (32).
EP10155334.5A 2009-03-12 2010-03-03 Pressure control valve Active EP2236781B1 (en)

Applications Claiming Priority (1)

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DE102009012872A DE102009012872A1 (en) 2009-03-12 2009-03-12 Pressure control valve

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EP2236781B1 true EP2236781B1 (en) 2018-05-16

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DE102016003767B4 (en) * 2016-04-01 2021-02-11 Mann+Hummel Gmbh Switching membrane for a pressure control valve
DE102016211265B4 (en) 2016-06-23 2018-01-04 Polytec Plastics Germany Gmbh & Co. Kg Flow control valve
DE102017205169B3 (en) 2017-03-28 2018-09-06 Bayerische Motoren Werke Aktiengesellschaft Pressure control valve for an internal combustion engine
DE102019202056B4 (en) * 2019-02-15 2020-09-10 Polytec Plastics Germany Gmbh & Co. Kg Pressure control device
JP7218638B2 (en) * 2019-03-20 2023-02-07 日本電産トーソク株式会社 reflux valve
JP7218639B2 (en) * 2019-03-20 2023-02-07 日本電産トーソク株式会社 reflux valve

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GB648302A (en) * 1946-09-11 1951-01-03 Thomas Costello Improvements in or relating to fluid pressure reducing valves
DE7032571U (en) * 1970-09-01 1972-03-02 Kloeckner Humboldt Deutz Ag CRANKCASE VENTILATION.
US3754570A (en) * 1972-06-20 1973-08-28 Textron Inc Safety control for fluid pressure regulators
US3989060A (en) * 1975-05-29 1976-11-02 Textron, Inc. Gas pressure regulator
DE2753335C2 (en) * 1977-11-30 1983-05-19 Klöckner-Humboldt-Deutz AG, 5000 Köln Crankcase ventilation valve
DE4445589C2 (en) * 1994-12-20 1997-12-18 Danfoss As Diaphragm controlled valve to maintain a differential pressure
DE20016214U1 (en) * 2000-09-18 2002-02-07 Hengst Walter Gmbh & Co Kg Throttle valve for automatic regulation of the pressure in the crankcase of an internal combustion engine
FR2844547B1 (en) * 2002-09-16 2004-10-22 Peugeot Citroen Automobiles Sa PRESSURE RELIEF DEVICE FOR AN INTERNAL COMBUSTION ENGINE, PARTICULARLY FOR A MOTOR VEHICLE
DE202004003860U1 (en) 2004-03-12 2005-07-21 Hengst Gmbh & Co.Kg Pneumatic pressure regulation valve for a gas line has an additional pre-stop for the actuating membrane, or a component moved by it, as well as a final stop
RU2461046C2 (en) * 2007-04-20 2012-09-10 Фишер Контролз Интернешнел Ллс Fluid regulator

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